Answer:
In the 1800's. If you wanna be really specific, it's the late 1790's.
Industrialization and reform (1870-1916) The industrial growth that began in the United States in the early 1800's continued steadily up to and through the American Civil War. Still, by the end of the war, the typical American industry was small. They had a lot of coal and water for power and a large supply of immigrants for workers. Samuel Slater brought the secret of British textile to America. Railroad building and joint stock companies.
